Abstract
Nitrogen management for conventional tillage (CT) corn ( Zea mays L.) production is highly dependent on local soil and climatic conditions. Nitrogen fertilizer source, time of application, and use of nitrification inhibitors (NI) are components of an N management program which easily can be varied by the producer. An 8‐yr study was undertaken in Ohio to assess N fertilizer management for CT corn production on a Crosby silt loam soil (fine, mixed, mesic Aerie Ochraqualf). Nitrogen fertilizer treatments compared in the study were fall and spring‐preplant broadcast and incorporated urea, and fall and spring‐preplant anhydrous ammonia (AA), with and without the NI, nitrapyrin [2‐chloro‐6‐(trichloromethyl) pyridine]. Each N treatment was applied at rates of 80 and 160 lb/acre. Spring urea also was applied at 240 and 320 lb N/acre. Both grain yield and percent N in the ear leaf at tasseling were increased with increases in N rate for all N source × application time × NI treatments. For increasing rates of N, anhydrous ammonia produced higher yields and gave greater increases in percent ear‐leaf N than did urea. Spring‐preplant application of both N sources gave higher yields than fall application. Nitrapyrin with spring‐applied AA gave no yield or percent ear‐leaf N increases. However, NI with fall‐applied AA did increase grain yield over fall‐applied AA without NI. While significant year‐to‐year and treatment year variability was present in the study, the 8‐yr average results can be used in formulating N management recommendations for CT corn production in similar soils in the North Central USA.
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Claims 10
Claim · model-written summary
Corn grain yield increased with nitrogen rate across source, time and inhibitor treatments.
Not reportedTaxonComparator
Verbatim
e0“Both grain yield and percent N in the ear leaf at tasseling were increased with increases in N rate for all N source × application time × NI treatments.”
Claim · model-written summary
Corn ear-leaf nitrogen percentage increased with nitrogen rate across source, time and inhibitor treatments.
Not reportedTaxonComparator
Verbatim
e0“Both grain yield and percent N in the ear leaf at tasseling were increased with increases in N rate for all N source × application time × NI treatments.”
Claim · model-written summary
At increasing nitrogen rates, anhydrous ammonia produced higher corn yields than urea.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- anhydrous ammoniae0
- Outcome
- yieldse0
- Direction
- highere0
- Comparator
- ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For increasing rates of N, anhydrous ammonia produced higher yields and gave greater increases in percent ear‐leaf N than did urea.”
t0“Corn”
Claim · model-written summary
At increasing nitrogen rates, anhydrous ammonia gave greater ear-leaf nitrogen percentage increases than urea.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- anhydrous ammoniae0
- Outcome
- percent ear‐leaf Ne0
- Direction
- greater increasese0
- Comparator
- ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For increasing rates of N, anhydrous ammonia produced higher yields and gave greater increases in percent ear‐leaf N than did urea.”
t0“Corn”
Claim · model-written summary
Spring preplant application of both nitrogen sources gave higher corn yields than fall application.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Spring‐preplant applicatione0
- Outcome
- yieldse0
- Direction
- highere0
- Comparator
- fall applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring‐preplant application of both N sources gave higher yields than fall application.”
t0“Corn”
Claim · model-written summary
Nitrapyrin added to spring-applied anhydrous ammonia gave no increase in corn yield.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Nitrapyrin with spring‐applied AAe0
- Outcome
- yielde0
- Direction
- no yielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrapyrin with spring‐applied AA gave no yield or percent ear‐leaf N increases.”
t0“Corn”
Claim · model-written summary
Nitrapyrin added to spring-applied anhydrous ammonia gave no increase in corn ear-leaf nitrogen percentage.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Nitrapyrin with spring‐applied AAe0
- Outcome
- percent ear‐leaf Ne0
- Direction
- no yield or percent ear‐leaf N increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrapyrin with spring‐applied AA gave no yield or percent ear‐leaf N increases.”
t0“Corn”
Claim · model-written summary
Nitrapyrin added to fall-applied anhydrous ammonia increased corn grain yield relative to no inhibitor.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- NI with fall‐applied AAe0
- Outcome
- grain yielde0
- Direction
- increasee0
- Comparator
- fall‐applied AA without NIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NI with fall‐applied AA did increase grain yield over fall‐applied AA without NI.”
t0“Corn”
Claim · model-written summary
The study observed significant variability between years and treatment years.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- year‐to‐year and treatment year variabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant year‐to‐year and treatment year variability was present in the study”
t0“Corn”
Claim · model-written summary
The authors suggest using the eight-year average to formulate nitrogen management recommendations for conventional tillage corn in similar North Central USA soils.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- N management recommendations for CT corn productione0
- Setting
- North Central USAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 8‐yr average results can be used in formulating N management recommendations for CT corn production in similar soils in the North Central USA”
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